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From the initial R&D unit, which was a single way BWTS such as electrolysis to the final certified version, the path was full of surprises. The initial failures obtaining the D2 standards due to the challenging water biology have challenged ERMA FIRST scientists and engineers. The focus on the compliance at real and not favourable conditions have led technology upgrade from just electrolysis to a double stage treatment, filtration and electrolysis. This proved to be successful.